who has the most career games played before age 20 mlb

Robin Yount has the most career games by a player younger than 20, with 243 games.

Interpreted as:

Who has the most career regular-season games played before age 20 MLB?

	NAME	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Robin Yount R. Yount	243	857	109	223	41	6	11	75	43	2	110	18	11	921	309	58	14	5	3	11	.260	.295	.361	.656
2	Mel Ott M. Ott	241	658	99	209	35	7	19	100	67	2	54	6		741	315	61	14				.318	.382	.479	.861
3	Phil Cavarretta P. Cavarretta	220	856	120	235	36	14	14	119	52	4	84	8		919	341	64	7				.275	.319	.398	.717
4	Ed Kranepool E. Kranepool	208	699	69	166	32	6	12	59	50	2	101	4	4	761	246	50	4	6	2	19	.237	.288	.352	.640
5	Al Kaline A. Kaline	168	532	52	146	18	3	5	45	23	1	49	10	5	565	185	26	7	2		22	.274	.305	.348	.652
6	Cass Michaels C. Michaels	158	520	51	121	12	6	2	59	39	3	33	8		577	151	20	15			14	.233	.290	.290	.580
7	Freddie Lindstrom F. Lindstrom	157	435	62	122	18	13	4	37	28	3	30	8		473	178	35	7				.280	.328	.409	.738
8	Rusty Staub R. Staub	150	513	43	115	17	4	6	45	59	5	58	0	0	585	158	27	6	2	8	11	.224	.309	.308	.617
9	Bryce Harper B. Harper	139	533	98	144	26	9	22	59	56	2	120	18	6	597	254	57	3	3	0	8	.270	.340	.477	.817
10	Sibby Sisti S. Sisti	129	464	55	109	17	4	5	31	22	3	74	7		501	149	26	12			8	.235	.274	.321	.595
11	Ken Griffey Jr. K. Griffey Jr.	127	455	61	120	23	0	16	61	44	2	83	16	7	506	191	39	1	4	8	4	.264	.329	.420	.748
12	Merito Acosta M. Acosta	124	257	33	59	6	4	0		44	4	35	13		315	73	10	10				.230	.351	.284	.635
13	Wayne Causey W. Causey	121	263	21	49	2	2	2	13	25	1	48	0	2	293	61	6	3	1	1	4	.186	.259	.232	.491
14	Tommy Brown T. Brown	118	376	33	80	8	4	2	29	15	0	40	3		399	102	14	8			7	.213	.243	.271	.514
15	Juan Soto J. Soto	116	414	77	121	25	1	22	70	79	0	99	5	2	494	214	48	1	0	10	9	.292	.406	.517	.923
16	Clete Boyer C. Boyer	114	208	18	47	4	1	1	10	15	1	44	1	1	226	56	6	2	0	1	5	.226	.281	.269	.550
17	Ed Kirkpatrick E. Kirkpatrick	112	302	24	68	18	3	4	28	29	3	51	3	2	339	104	25	0	5	6	8	.225	.295	.344	.639
18	Bob Kennedy B. Kennedy	112	449	64	118	20	2	3	39	31	0	36	2		487	151	25	7			12	.263	.310	.336	.647
19	Tony Conigliaro T. Conigliaro	111	404	69	117	21	2	24	52	35	5	78	2	4	444	214	47	0	0	1	11	.290	.354	.530	.883
20	Billy Consolo B. Consolo	108	234	24	53	8	1	2	12	21	1	73	3	3	256	69	11	0	0		2	.226	.293	.295	.588
21	Buddy Lewis B. Lewis	108	472	66	136	17	8	3	48	26	2	36	3		501	178	28	1				.288	.328	.377	.705
22	Bobby Del Greco B. Del Greco	99	341	34	74	14	2	1	20	38	3	70	6	5	385	95	17	3			9	.217	.301	.279	.580
23	Travis Jackson T. Jackson	99	336	46	90	12	7	4	37	21	0	42	3		359	128	23	2				.268	.311	.381	.692
24	Jimmie Foxx J. Foxx	97	171	33	58	9	6	3	26	16	1	18	3		191	88	18	3				.339	.399	.515	.914
25	Mickey Mantle M. Mantle	96	341	61	91	11	5	13	65	43	0	74	8	7	386	151	29	2			3	.267	.349	.443	.792